There was a lot in Moltherak's long-winded explanation that Leo couldn't quite understand yet, but there was also plenty he did grasp.
For one, Moltherak seemed to have been humbled by time.
He spoke of his past slaughters not with pride, but with a distant heaviness, as though they were once achievements he flaunted….. yet were actions that he now looked back with regret.
He looked quite pitiful when he talked like that, however, Leo only thought of him as a 'Whiny Bitch', when he suddenly went all monk mode on him.
However, apart from that, everything else he talked about was quite fascinating.
For one, all the ancient beasts were Demi-God tier beings, whose souls had attained godhood, but bodies had not.
Hence, after their bodies were destroyed, their souls had to be sealed in time-stilled worlds, which now acted as their prisons for eternity.